写作业的英语是 do the homework。其中，“do”是动词，表示“做”或“执行”的意思，“homework”是名词，表示“家庭作业”或“功课”。所以，当你想要表达“写作业”这个意思时，可以说“do the homework”。例如：

1. It's time to do the homework.

2. I need to do my homework before I can go out.

3. She is doing her homework right now.